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OTHER FINANCIAL DATA Other Financial Data (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Incentive Compensation Expense | $ 423 | $ 25,607 | $ 29,612
Rent Expense | 4,889 | 4,914 | 5,071
Warranty and Retrofit Expense | $ 13,030 | $ 13,110 | $ 13,740

X
- Definition Amount of selling general and administrative incentive compensation expenses during the reporting period. + References No definition available. + Details
Name: | klic_SellingGeneralAndAdministrativeIncentiveCompensationExpense
Namespace Prefix: | klic_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of warranty and retrofit expenses during the period. + References No definition available. + Details
Name: | klic_WarrantyAndRetrofitExpense
Namespace Prefix: | klic_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration